package ncme.auto.framework.core.utils;

import ncme.auto.framework.core.exceptions.AutoException;
import ncme.auto.framework.core.exceptions.ExceptionEnum;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.util.CellRangeAddress;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

/**
 * @author sjh
 * Description
 * create 2021/6/21 11:25
 */
public class ExcelUtil {
    public static HSSFWorkbook getExcel(String title, String[] rowsName, List<Object[]> dataList) {
        try {
            HSSFWorkbook workbook = new HSSFWorkbook();
            HSSFSheet sheet = workbook.createSheet(title);

            // 产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTitle = rowm.createCell(0);


            //sheet样式定义
            HSSFCellStyle columnTopStyle = getColumnTopStyle(workbook);
            HSSFCellStyle style = getCellStyle(workbook);
            sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowsName.length - 1)));
            cellTitle.setCellStyle(columnTopStyle);
            cellTitle.setCellValue("");

            // 定义所需列数
            int columnNum = rowsName.length;
            HSSFRow rowRowName = sheet.createRow(2);

            // 将列头设置到sheet的单元格中
            for (int n = 0; n < columnNum; n++) {
                HSSFCell cellRowName = rowRowName.createCell(n);
                cellRowName.setCellType(CellType.STRING);
                HSSFRichTextString text = new HSSFRichTextString(rowsName[n]);
                cellRowName.setCellValue(text);
                cellRowName.setCellStyle(columnTopStyle);
            }
            // 将查询到的数据设置到sheet对应的单元格中
            for (int i = 0; i < dataList.size(); i++) {
                Object[] obj = dataList.get(i);// 遍历每个对象
                HSSFRow row = sheet.createRow(i + 3);// 创建所需的行数

                for (int j = 0; j < obj.length; j++) {
                    HSSFCell cell = null;
//                    if (j == 0) {
                    if (j < 0) {
                        cell = row.createCell(j, CellType.STRING);
                        cell.setCellValue(i + 1);
                    } else {
                        cell = row.createCell(j, CellType.STRING);
                        Object content = obj[j];
                        if (!"".equals(content) && content != null) {
                            cell.setCellValue(content.toString());
                        } else cell.setCellValue("");
                    }
                    cell.setCellStyle(style);
                }
            }
            // 让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                    HSSFRow currentRow;
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == CellType.STRING) {
                            int length = currentCell.getStringCellValue().getBytes().length;
                            if (columnWidth < length) {
                                columnWidth = length;
                            }
                        }
                    }
                }
                if (colNum == 0) {
                    sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
                } else {
                    sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
                }
            }
            return workbook;
        } catch (Exception e) {
            throw new AutoException(ExceptionEnum.SERVICE_OTHER, "excel文件生成异常");
        }
    }

    public static HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        // 设置字体大小
        font.setFontHeightInPoints((short) 11);
        // 字体加粗
        font.setBold(false);
        // 设置字体名字
        font.setFontName("宋体");
        font.setFontName("Times New Roman");
        // 设置样式
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置底边框
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        // 设置右边框
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        // 设置左边框
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        // 设置顶边框
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        // 在样式中应用设置的字体
        style.setFont(font);
        // 设置自动换行
        style.setWrapText(false);
        // 设置水平对齐的样式为居中对齐；
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        return style;
    }

    public static HSSFCellStyle getCellStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        // 设置字体大小
        font.setFontHeightInPoints((short) 10);
        // 字体加粗
        font.setBold(false);
        // 设置字体名字
        font.setFontName("宋体");
        font.setFontName("Times New Roman");
        // 设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置底边框
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        // 设置右边框
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        // 设置左边框
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        // 设置顶边框
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        // 在样式用应用设置的字体;
        style.setFont(font);
        // 设置自动换行;
        style.setWrapText(false);
        // 设置水平对齐的样式为居中对齐;
        style.setAlignment(HorizontalAlignment.CENTER);
        // 设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        return style;
    }

    public static boolean exportExcel(HttpServletResponse response, HSSFWorkbook hssfWorkbook, String fileName) throws IOException {
        if (!fileName.contains(".xls")) fileName += ".xls";
        //告诉浏览器数据格式，将头和数据传到前台
        String headStr = "attachment; filename=\"" + fileName + "\"";
//        response.setContentType("APPLICATION/OCTET-STREAM");
        response.setHeader("Content-Disposition", headStr);
        //写入数据流
        OutputStream outputStream = response.getOutputStream();
        if (hssfWorkbook != null) {
            try {
                hssfWorkbook.write(outputStream);
                outputStream.flush();
                outputStream.close();
                return true;
            } catch (Exception e) {
                e.printStackTrace();
                outputStream.flush();
                outputStream.close();
                return false;
            }
        }
        return false;
    }
}
